Re: [PATCH v12 8/9] gfxstream + rutabaga: enable rutabaga

[Gurchetan Singh <gurchetansingh@chromium.org>]

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On Fri, Aug 25, 2023 at 6:55 AM Antonio Caggiano <quic_acaggian@quicinc.com>
wrote:

> Hi Gurchetan,
>
> Thank you for this series and for including some of my patches :)
>
> On 25/08/2023 01:40, Gurchetan Singh wrote:
> > This change enables rutabaga to receive virtio-gpu-3d hypercalls
> > when it is active.
> >
> > Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
> > Tested-by: Alyssa Ross <hi@alyssa.is>
> > Tested-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
> > Reviewed-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
> > ---
> > v3: Whitespace fix (Akihiko)
> > v9: reorder virtio_gpu_have_udmabuf() after checking if rutabaga
> >      is enabled to avoid spurious warnings (Akihiko)
> >
> >   hw/display/virtio-gpu-base.c | 3 ++-
> >   hw/display/virtio-gpu.c      | 5 +++--
> >   softmmu/qdev-monitor.c       | 3 +++
> >   softmmu/vl.c                 | 1 +
> >   4 files changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
> > index 4f2b0ba1f3..50c5373b65 100644
> > --- a/hw/display/virtio-gpu-base.c
> > +++ b/hw/display/virtio-gpu-base.c
> > @@ -223,7 +223,8 @@ virtio_gpu_base_get_features(VirtIODevice *vdev,
> uint64_t features,
> >   {
> >       VirtIOGPUBase *g = VIRTIO_GPU_BASE(vdev);
> >
> > -    if (virtio_gpu_virgl_enabled(g->conf)) {
> > +    if (virtio_gpu_virgl_enabled(g->conf) ||
> > +        virtio_gpu_rutabaga_enabled(g->conf)) {
> >           features |= (1 << VIRTIO_GPU_F_VIRGL);
> >       }
> >       if (virtio_gpu_edid_enabled(g->conf)) {
> > diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
> > index 3e658f1fef..fe094addef 100644
> > --- a/hw/display/virtio-gpu.c
> > +++ b/hw/display/virtio-gpu.c
> > @@ -1361,8 +1361,9 @@ void virtio_gpu_device_realize(DeviceState *qdev,
> Error **errp)
> >       VirtIOGPU *g = VIRTIO_GPU(qdev);
> >
> >       if (virtio_gpu_blob_enabled(g->parent_obj.conf)) {
> > -        if (!virtio_gpu_have_udmabuf()) {
> > -            error_setg(errp, "cannot enable blob resources without
> udmabuf");
> > +        if (!virtio_gpu_rutabaga_enabled(g->parent_obj.conf) &&
> > +            !virtio_gpu_have_udmabuf()) {
> > +            error_setg(errp, "need rutabaga or udmabuf for blob
> resources");
>
> Does that mean udmabuf is not required at all when using rutabaga?
> How does rutabaga handle blob resources?
>

It's not required, since it's a Linux-only thing.  Some use cases do prefer
to use guest memory and we do have provisional support for that (see
`handle` field of `rutabaga_resource_create_blob`).  Though more testing is
required on the target platform, and likely virtio-gpu spec changes for a
full-functional solution.



>
> >               return;
> >           }
> >
> > diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
> > index 74f4e41338..1b8005ae55 100644
> > --- a/softmmu/qdev-monitor.c
> > +++ b/softmmu/qdev-monitor.c
> > @@ -86,6 +86,9 @@ static const QDevAlias qdev_alias_table[] = {
> >       { "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_VIRTIO_PCI },
> >       { "virtio-gpu-gl-device", "virtio-gpu-gl", QEMU_ARCH_VIRTIO_MMIO },
> >       { "virtio-gpu-gl-pci", "virtio-gpu-gl", QEMU_ARCH_VIRTIO_PCI },
> > +    { "virtio-gpu-rutabaga-device", "virtio-gpu-rutabaga",
> > +      QEMU_ARCH_VIRTIO_MMIO },
> > +    { "virtio-gpu-rutabaga-pci", "virtio-gpu-rutabaga",
> QEMU_ARCH_VIRTIO_PCI },
> >       { "virtio-input-host-device", "virtio-input-host",
> QEMU_ARCH_VIRTIO_MMIO },
> >       { "virtio-input-host-ccw", "virtio-input-host",
> QEMU_ARCH_VIRTIO_CCW },
> >       { "virtio-input-host-pci", "virtio-input-host",
> QEMU_ARCH_VIRTIO_PCI },
> > diff --git a/softmmu/vl.c b/softmmu/vl.c
> > index b0b96f67fa..2f98eefdf3 100644
> > --- a/softmmu/vl.c
> > +++ b/softmmu/vl.c
> > @@ -216,6 +216,7 @@ static struct {
> >       { .driver = "ati-vga",              .flag = &default_vga       },
> >       { .driver = "vhost-user-vga",       .flag = &default_vga       },
> >       { .driver = "virtio-vga-gl",        .flag = &default_vga       },
> > +    { .driver = "virtio-vga-rutabaga",  .flag = &default_vga       },
> >   };
> >
> >   static QemuOptsList qemu_rtc_opts = {
>
> Patches 5 to 9:
> Reviewed-by: Antonio Caggiano <quic_acaggian@quicinc.com>
>
> Cheers,
> Antonio
>

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